sdl: Fix bindings for several methods, delegates and classes
sdl: Fix bindings for several methods, delegates and classes

Let Thread and Timer classes be unmanaged by vala.

Fixes bug 655143.

spidermonkdust/vala,jessevdk/vala,kamanashisroy/aroop,playya/vala,rvu95/vala,severinh/vala,severinh/vala,GNOME/vala,GNOME/vala,Distrotech/vala,xdave/pvala,GNOME/vala,frida/vala,playya/vala,kamanashisroy/aroop,kamanashisroy/aroop,flobrosch/vala-fixes,rvu95/vala,tjol/vala-tjol,tjol/vala-tjol,spidermonkdust/vala,jessevdk/vala,tjol/vala-tjol,Distrotech/vala,GNOME/vala,frida/vala,flobrosch/vala-fixes,severinh/vala,rvu95/vala,Distrotech/vala,jessevdk/vala,spidermonkdust/vala,frida/vala,flobrosch/vala-fixes,playya/vala,frida/vala,frida/vala